Session D40 - Poster Session I.
POSTER session, Monday afternoon, March 12
Exhibit Hall, Washington State Convention Center
A series of polyurethanes derived from long-chain aliphatic diols and much shorter diisocyanates were synthesized by melt polyadditions and characterized. Their solubility in m-cresol at slightly elevated temperatures indicated the absence of crosslinking. By diluting the amount of carbamate esters, polyethylene-like polyurethanes were synthesized. As the aliphatic segments were increased and the hydrogen bonding densities decreased, the polyurethanes displayed physical and thermal characteristics, including melting point, long period, and solubility, typical of polyethylene. However, crystallization studies showed that hydrogen bonding still controlled the crystallization process of these long-chain aliphatic polyurethanes resulting in the analogous crystal structure and morphology as polyamides and polyurethanes of higher hydrogen bonding densities.